阅读下面短文，从短文后所给的A、B、C三个选项中选出能填入相应空白处的最佳选项。
On Thursday，Richard arrived at school with a big smile on his face．“Why are you so 1 ?”asked David．“Tonight my dad is going to bring home my new dog，”answered Richard．“What are you going to 2 it?”asked David．“I don't know yet，”answered Richard．
All day long，Richard 3 about dog's names．During the math lesson，he thought about the name “Zero”．During the English lesson．he thought about the names“Mary” and “Jim”．At the 4 of the day，he still did not know what to name his dog．So he was really 5 ．
As soon as school was over，Richard ran 6 ．When he opened the door，a little ball came running toward Richard．Richard 7the little dog．He held the dog close to his 8 immediately，Richard sneezed(打喷嚏)，“Ah choo!”And again，he sneezed，“Ah choo!”His nose started to run．
“Oh no!”said Richard's dad．“You must be allergic(过敏的)to the 9．He will have to stay at your uncle's house．”“Ugh!”said Richard 10 ，“I was going to name him Sneezy!”
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